Plant hormones

Do plant hormones act locally or generally?

Locally

What is the main plant hormone?

auxin

Which two sides do the auxins accumulate on?

the shaded and the lower side

What are the three stimulus' plants react to?

Phototropism (light), geotropism (gravity) and touch

Shoots are..

Positively phototropic and negatively geotropic

Roots are...

positively geotropic and negatively phototropic

What is the auxins journey?

Produced> dissolved> diffused

When auxins diffuse in a root, what does it do?

inhibits growth

When auxins diffuse in a shoot, what does it do?

stimulates growth

What is the process that happens to the cells during their growth?

elongation

In roots, which side grows?

The side where the auxins are NOT there as it inhibits growth

What are the three plant hormones

Auxins, gibberellin and ethene.

What hormone is an auxin?

Growth

What hormones are gibberellins?

Dormancy control

What hormone is ethene?

Ripening control

What is a commercial use of auxins in plant cloning?

Auxins are used in a growth medium to stimulate growth in plant clones.

How are auxins used in cuttings?

Root powder containing auxins is added to produce roots and promote growth.

How do auxins function as selective weedkillers?

High concentrations of auxins can disrupt growth patterns in weeds, causing them to die.

What do gibberellins induce?

Germination

What is the benefit of gibberellins inducing germination?

More crops grown per year and at the same time

Gibberellins induce...

flowering so there's more and they are bigger

Why do Gibberellins target seedless fruits to grow them larger?

They don't usually grow as big as those with seeds

Ethene as a plant hormone is used when...

Fruit is picked before ripe> gets shipped> injected with ethene> turns ripe and ready to sell

Why do we block ethene from fruits?

Fruits produce their own ethene which we stop to prevent them from ripening too quickly

How does ethene work as a plant hormone?

It stimulates enzymes which cause ripening